Machining coolant block counterbored threaded hole.
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Previously:
https://www.homemadetools.net/forum/...137#post227216
https://www.homemadetools.net/forum/...132#post199439
https://www.homemadetools.net/forum/...414#post228146
https://www.homemadetools.net/forum/...535#post234668
https://www.homemadetools.net/forum/...059#post230201
